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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (35)
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If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...) -
Ajouter notes et légendes aux images
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Sur d’autres sites (8000)
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Not able to link ffmpeg library in cython package
12 août 2020, par Sagar DonadkarI am using cython package to call Cpp API and in my cpp code i am using ffmpeg library when i try to build my code i got and linking issue
In header file add include ffmpeg header file to call ffmpeg library function


header file
#ifndef RECTANGLE_H
#define RECTANGLE_H
#include <iostream>

extern "C"
{
 #include "libavformat/avformat.h"
 #include "libavutil/dict.h"
}

using namespace std;

namespace shapes 
{
 class Rectangle {
 public:
 int x0, y0, x1, y1;
 Rectangle();
 Rectangle(int x0, int y0, int x1, int y1);
 ~Rectangle();
 int getArea();
 int ffmpegFile();
 void getSize(int* width, int* height);
 void move(int dx, int dy);
 };
}

#endif
</iostream>

Rectangle.Cpp file in ffmpegFile() i am using ffmpeg example code to test ffmpeg my code where i call mostly ffmpeg API



#include <iostream>
#include "Rectangle.hpp"

namespace shapes {
 

 // Default constructor
 Rectangle::Rectangle () {}

 // Overloaded constructor
 Rectangle::Rectangle (int x0, int y0, int x1, int y1) {
 this->x0 = x0;
 this->y0 = y0;
 this->x1 = x1;
 this->y1 = y1;
 }

 // Destructor
 Rectangle::~Rectangle () {}

 // Return the area of the rectangle
 int Rectangle::getArea () {
 return 10;
 }

 // Get the size of the rectangle.
 // Put the size in the pointer args
 void Rectangle::getSize (int *width, int *height) {
 (*width) = x1 - x0;
 (*height) = y1 - y0;
 }

 // Move the rectangle by dx dy
 void Rectangle::move (int dx, int dy) {
 this->x0 += dx;
 this->y0 += dy;
 this->x1 += dx;
 this->y1 += dy;
 }
 int Rectangle::ffmpegFile()
 {
 AVFormatContext *fmt_ctx = NULL;
 AVDictionaryEntry *tag = NULL;
 int ret = 0;
 char* filename = "D:\\Discovery.mp4";

 if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)))
 return ret;

 if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
 av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
 return ret;
 }

 while ((tag = av_dict_get(fmt_ctx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX)))
 printf("%s=%s\n", tag->key, tag->value);

 avformat_close_input(&fmt_ctx);
 return ret;
 }
}
</iostream>

Rectangle.pxd file declaration for cpp file function and variable


cdef extern from "Rectangle.cpp":
 pass
cdef extern from "Rectangle.hpp" namespace "shapes":
 cdef cppclass Rectangle:
 Rectangle() except +
 Rectangle(int, int, int, int) except +
 int x0, y0, x1, y1
 int getArea()
 void getSize(int* width, int* height)
 void move(int, int)
 int ffmpegFile()


rect.pyx file i am calling cpp API form pyx file


# distutils: language = c++

from Rectangle cimport Rectangle

cdef class PyRectangle:
 cdef Rectangle c_rect # Hold a C++ instance which we're wrapping

 def __cinit__(self, int x0, int y0, int x1, int y1):
 self.c_rect = Rectangle(x0, y0, x1, y1)

 def get_area(self):
 return self.c_rect.getArea()

 def get_size(self):
 cdef int width, height
 self.c_rect.getSize(&width, &height)
 return width, height

 def move(self):
 print(self.c_rect.ffmpegFile())


setup.py
I provided pyx file and ffmpeg library path as well as include path


from setuptools import setup,Extension
from Cython.Build import cythonize 


directives={'linetrace':False, 'language_level':3}

setup(name = 'superfastcode', version = '1.0',
 description = 'Python Package with superfastcode C++ extension',
 ext_modules=cythonize([
 Extension(
 'demo',["rect.pyx"],
 include_dirs=['ffmpeg\\include'],)
 library_dirs=["ffmpeg\\lib"],
 libraries=["avcodec","avformat","avutil","swscale","avdevice","avfilter","postproc","swresample"]),
 
]))


getting below error


PS D:\SiVUE\Backend\Cython\demo> python setup.py build_ext --inplace
Compiling rect.pyx because it depends on .\Rectangle.pxd.
[1/1] Cythonizing rect.pyx
C:\python3.8\lib\site-packages\Cython\Compiler\Main.py:369: FutureWarning: Cython directive 'language_level' not set, using 2 for now (Py2). This will change in a later release! File: D:\SiVUE\Backend\Cython\demo\rect.pyx
 tree = Parsing.p_module(s, pxd, full_module_name)
running build_ext
building 'demo' extension
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX86\x86\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -I. -Iffmpeg\include -IC:\python3.8\include -IC:\python3.8\include "-IC:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\include" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt" /EHsc /Tprect.cpp /Fobuild\temp.win32-3.8\Release\rect.obj
rect.cpp
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\bin\HostX86\x86\link.exe /nologo /INCREMENTAL:NO /LTCG /DLL /MANIFEST:EMBED,ID=2 /MANIFESTUAC:NO /LIBPATH:ffmpeg\lib /LIBPATH:C:\python3.8\libs /LIBPATH:C:\python3.8\PCbuild\win32 "/LIBPATH:C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.26.28801\lib\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\lib\um\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\ucrt\x86" "/LIBPATH:C:\Program Files (x86)\Windows Kits\10\lib\10.0.18362.0\um\x86" avcodec.lib avformat.lib avutil.lib swscale.lib avdevice.lib avfilter.lib postproc.lib swresample.lib /EXPORT:PyInit_demo build\temp.win32-3.8\Release\rect.obj /OUT:build\lib.win32-3.8\demo.cp38-win32.pyd /IMPLIB:build\temp.win32-3.8\Release\demo.cp38-win32.lib
 Creating library build\temp.win32-3.8\Release\demo.cp38-win32.lib and object build\temp.win32-3.8\Release\demo.cp38-win32.exp
rect.obj : error LNK2001: unresolved external symbol _avformat_open_input
rect.obj : error LNK2001: unresolved external symbol _av_log
rect.obj : error LNK2001: unresolved external symbol _avformat_close_input
rect.obj : error LNK2001: unresolved external symbol _avformat_find_stream_info
rect.obj : error LNK2001: unresolved external symbol _av_dict_get
build\lib.win32-3.8\demo.cp38-win32.pyd : fatal error LNK1120: 5 unresolved externals
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Community\\VC\\Tools\\MSVC\\14.26.28801\\bin\\HostX86\\x86\\link.exe' failed with exit status 1120


Thank You


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How to receive upd stream with OpenCV ?
17 février 2021, par LegionI need to receive my stream from Jetson Nano to my OpenCV program on my PC (Windows 10).


Ok, I stream camera from my device (Jetson Nano) using :


cv::VideoWriter gst_udpsink("appsrc ! video/x-raw, format=BGR ! queue ! videoconvert ! video/x-raw, format=BGRx ! nvvidconv ! nvv4l2h264enc insert-vui=1 ! video/x-h264, stream-format=byte-stream ! h264parse ! rtph264pay pt=96 config-interval=1 ! udpsink host=224.1.1.1 port=5000 auto-multicast=true", cv::CAP_GSTREAMER, 0, fps, cv::Size (width, height));


I installed OpenCV with Gstreamer(following that ) and tried that command


c:\gstreamer\1.0\msvc_x86_64\bin\gst-launch-1.0.exe udpsrc uri=udp://224.1.1.1:5000 auto-multicast=true ! application/x-rtp, media=video, encoding-name=H264 ! rtpjitterbuffer latency=300 ! rtph264depay ! decodebin ! d3dvideosink


it is working, unfortunately, no matter what latency I set I still got quite a big lag.
When I try to use OpenCV


cv::VideoCapture cap("udpsrc uri=udp://224.1.1.1:5000 auto-multicast=true ! application/x-rtp, media=video, encoding-name=H264 ! rtpjitterbuffer latency=300 ! rtph264depay ! decodebin ! videoconvert ! video/x-raw, format=BGR ! appsink", cv::CAP_GSTREAMER);


I get


[ WARN:0] global F:\Code\opencv_4.5.1\opencv-4.5.1\modules\videoio\src\cap_gstreamer.cpp (734) cv::GStreamerCapture::open OpenCV | GStreamer warning: Error opening bin: no element "udpsrc"
[ WARN:0] global F:\Code\opencv_4.5.1\opencv-4.5.1\modules\videoio\src\cap_gstreamer.cpp (501) cv::GStreamerCapture::isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created


And .isOpened() give me false.
I’m don’t know why did I install something wrong ?


I added everything to my PATH as instructed




I also tried to use FFmpeg :


setenv ("OPENCV_FFMPEG_CAPTURE_OPTIONS", "protocol_whitelist;file,rtp,udp", 1);
cap = cv::VideoCapture("test.sdp", cv::CAP_FFMPEG);


I get :


[rtp @ 0000014dc1f83bc0] Protocol 'rtp' not on whitelist 'file,crypto,data'!


I have no setenv() so I tried this and it seems that’s a problem, any idea ?


Shell equivalent


ffplay myFile.sdp -protocol_whitelist file,udp,rtp -fflags nobuffer


Is working successfully (with delay but successfully).


I'm willing to change anything to make it work ! If it's possible with FFmpeg/GStreamer/vlclib, I can change the Jetson side as well, thanks for any help !


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candidate function not viable : no known conversion
11 septembre 2020, par yejafotI'm trying to compile my main.cpp, but I keep getting this error. The issue here is for the parameter


pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
 pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AVRounding)(AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
 pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);


the error which i got


app\src\main\libs\arm64-v8a\include\libavutil\mathematics.h:151:9: note: candidate function not viable: no known conversion from 'AVRational *' to 'AVRational' for 2nd argument; dereference the argument with *


As it is an ffmpeg example code and i didnt change anything. Android Studio throws error when i try to generate signed apk.


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